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This change introduces a new experiment `call_tracer_send_initial_metadata_is_an_annotation`. When enabled, the `CallTracer::RecordSendInitialMetadata` method will now record a `SendInitialMetadataAnnotation` and call a new `MutateSendInitialMetadata` method on the underlying `CallTracerInterface`. The `CallTracerInterface` and its implementations (including XorMetrics, OpenCensus, OpenTelemetry, and test fakes) have been updated to include the new `MutateSendInitialMetadata` virtual method. The existing `RecordSendInitialMetadata` implementations are modified to check the experiment flag and delegate to `MutateSendInitialMetadata` if the experiment is active. A new `SendInitialMetadataAnnotation` class is added, which inherits from `CallTracerAnnotationInterface::Annotation`. This annotation type is used to capture the state of the initial metadata for immutable tracing purposes. Additionally, `ForEachKeyValue` methods are added to `MetadataInfo` and `HttpAnnotation` to facilitate iterating over metadata key-value pairs for annotation recording. The experiment configuration files are updated to include the new experiment. PiperOrigin-RevId: 854227812